<?php
require_once 'Utils.php';
require_once 'config.php';
Class MySQLUtils {

	private $link_id;
	private $handle;
	private $is_log;
	private $time;

	//构造函数
	public function __construct() {
		$this -> time = $this -> microtime_float();
		$this -> connect(DB_HOST, DB_USER, DB_PWD, DB_NAME, 1);
		$this -> is_log = 1;
		/*if ($this -> is_log) {
			$handle = fopen("./dblog.log", "a+");
			$this -> handle = $handle;
		}*/
	}

	//数据库连接
	public function connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect = 0, $charset = 'utf8') {
		if ($pconnect == 0) {
			$this -> link_id = @mysql_connect($dbhost, $dbuser, $dbpw, true);
			if (!$this -> link_id) {
				$this -> halt("数据库连接失败");
			}
		} else {
			$this -> link_id = @mysql_pconnect($dbhost, $dbuser, $dbpw);
			if (!$this -> link_id) {
				$this -> halt("数据库持久连接失败");
			}
		}
		if (!@mysql_select_db($dbname, $this -> link_id)) {
			$this -> halt('数据库选择失败');
		}
		@mysql_query("set names " . $charset);
	}

	//查询
	public function query($sql) {
		$this -> write_log("查询 " . $sql);
		$query = @mysql_query($sql, $this -> link_id);
		if (!$query)
			$this -> halt('Query Error: ' . $sql);		
		return @mysql_result($query,0);
	}

	//获取一条记录（MYSQL_ASSOC，MYSQL_NUM，MYSQL_BOTH）
	public function get_one($sql, $result_type = MYSQL_ASSOC) {
		$query = $this -> query($sql);
		$rt = &mysql_fetch_array($query, $result_type);
		$this -> write_log("获取一条记录 " . $sql);
		return $rt;
	}

	//获取全部记录
	public function get_all($sql, $result_type = MYSQL_ASSOC) {
		$query = $this -> query($sql);
		$i = 0;
		$rt = array();
		while ($row = &mysql_fetch_array($query, $result_type)) {
			$rt[$i] = $row;
			$i++;
		}
		$this -> write_log("获取全部记录 " . $sql);
		return $rt;
	}

	//插入
	public function insert($table, $dataArray) {
		$field = "";
		$value = "";
		if (!is_array($dataArray) || count($dataArray) <= 0) {
			$this -> halt('没有要插入的数据');
			return false;
		}
		while (list($key, $val) = each($dataArray)) {
			$field .= "$key,";
			$value .= "'$val',";
		}
		$field = substr($field, 0, -1);
		$value = substr($value, 0, -1);
		$sql = "insert into $table($field) values($value)";
		$this -> write_log("插入 " . $sql);
		if (!$this -> query($sql))
			return false;
		return true;
	}

	//更新
	public function update($table, $dataArray, $condition = "") {
		if (!is_array($dataArray) || count($dataArray) <= 0) {
			$this -> halt('没有要更新的数据');
			return false;
		}
		$value = "";
		while (list($key, $val) = each($dataArray))
			$value .= "$key = '$val',";
		$value .= substr($value, 0, -1);
		$sql = "update $table set $value where 1=1 and $condition";
		$this -> write_log("更新 " . $sql);
		if (!$this -> query($sql))
			return false;
		return true;
	}

	//删除
	public function delete($table, $condition = "") {
		if (empty($condition)) {
			$this -> halt('没有设置删除的条件');
			return false;
		}
		$sql = "delete from $table where 1=1 and $condition";
		$this -> write_log("删除 " . $sql);
		if (!$this -> query($sql))
			return false;
		return true;
	}

	//返回结果集
	public function fetch_array($query, $result_type = MYSQL_ASSOC) {
		$this -> write_log("返回结果集");
		return mysql_fetch_array($query, $result_type);
	}

	//获取记录条数
	public function num_rows($results) {
		if (!is_bool($results)) {
			$num = mysql_num_rows($results);
			$this -> write_log("获取的记录条数为" . $num);
			return $num;
		} else {
			return 0;
		}
	}

	//释放结果集
	public function free_result() {
		$void = func_get_args();
		foreach ($void as $query) {
			if (is_resource($query) && get_resource_type($query) === 'mysql result') {
				return mysql_free_result($query);
			}
		}
		$this -> write_log("释放结果集");
	}

	//获取最后插入的id
	public function insert_id() {
		$id = mysql_insert_id($this -> link_id);
		$this -> write_log("最后插入的id为" . $id);
		return $id;
	}

	//关闭数据库连接
	protected function close() {
		$this -> write_log("已关闭数据库连接");
		return @mysql_close($this -> link_id);
	}

	//错误提示
	private function halt($msg = '') {
		$msg .= "\r\n" . mysql_error();
		$this -> write_log($msg);
		die($msg);
	}

	//析构函数
	public function __destruct() {
		$this -> free_result();
		$use_time = ($this -> microtime_float()) - ($this -> time);
		$this -> write_log("完成整个查询任务,所用时间为" . $use_time);
		/*if ($this -> is_log) {
			fclose($this -> handle);
		}*/
	}

	//写入日志文件
	public function write_log($msg = '') {
		/*if ($this -> is_log) {
		 $text = date("Y-m-d H:i:s") . " " . $msg . "\r\n";
		 fwrite($this -> handle, $text);
		 }*/
		//Utils::logger($msg);
	}

	//获取毫秒数
	public function microtime_float() {
		list($usec, $sec) = explode(" ", microtime());
		return ((float)$usec + (float)$sec);
	}

}
?>